diff --git a/docs/_quarto.yml b/docs/_quarto.yml
index 7125a677..01be9aac 100644
--- a/docs/_quarto.yml
+++ b/docs/_quarto.yml
@@ -201,7 +201,7 @@ quartodoc:
         - spawn_logger
         - setup_default_log
         - setup_mp_log
-        - name: Log
+        - name: Logger
           children: separate
         - name: Receiver
           children: separate
diff --git a/docs/changelog.qmd b/docs/changelog.qmd
index 88e764cb..79ac3dba 100644
--- a/docs/changelog.qmd
+++ b/docs/changelog.qmd
@@ -8,6 +8,10 @@ These are the unreleased changes of Delft-FIAT.
 ### Added
 
 ### Changed
+- Disabled locks when running 'single threaded'
+- Fixed logging of errors during settings file checks
+- Logging class `Log` is now called `Logger`
+- Specifying destination ('dst') is now optional for `setup_default_log`
 
 ### Deprecated
 
diff --git a/src/fiat/cli/main.py b/src/fiat/cli/main.py
index 3c089db1..51777767 100644
--- a/src/fiat/cli/main.py
+++ b/src/fiat/cli/main.py
@@ -47,23 +47,32 @@ def info(args):
 
 # Run FIAT function
 def run(args):
-    """_summary_."""
+    """Run the model from cli."""
+    # Setup the logger, first without a file
+    logger = setup_default_log(
+        "fiat",
+        level=2,
+    )
+    sys.stdout.write(fiat_start_str)
+
     # Setup the config reader
     cfg = file_path_check(args.config)
-    cfg = ConfigReader(cfg)
+    cfg = run_log(ConfigReader, logger, cfg)
 
+    # Set the threads is specified
     if args.threads is not None:
         assert int(args.threads)
         cfg.set("global.threads", int(args.threads))
 
-    # Setup the logger
+    # Complete the setup of the logger
     loglevel = check_loglevel(cfg.get("global.loglevel", "INFO"))
-    logger = setup_default_log(
-        "fiat",
-        level=loglevel + args.quiet - args.verbose,
+    logger.add_file_handler(
         dst=cfg.get("output.path"),
+        filename="fiat",
     )
-    sys.stdout.write(fiat_start_str)
+    logger.level = loglevel
+
+    # Add the model version
     logger.info(f"Delft-Fiat version: {__version__}")
 
     # Kickstart the model
diff --git a/src/fiat/cli/util.py b/src/fiat/cli/util.py
index 068c4672..24c983ef 100644
--- a/src/fiat/cli/util.py
+++ b/src/fiat/cli/util.py
@@ -4,7 +4,7 @@
 from pathlib import Path
 from typing import Callable
 
-from fiat.log import Log
+from fiat.log import Logger
 
 
 def file_path_check(path):
@@ -20,11 +20,12 @@ def file_path_check(path):
 
 def run_log(
     func: Callable,
-    logger: Log,
+    logger: Logger,
+    *args,
 ):
     """Cli friendly run for/ with logging exceptions."""
     try:
-        func()
+        out = func(*args)
     except BaseException:
         t, v, tb = sys.exc_info()
         msg = ",".join([str(item) for item in v.args])
@@ -33,3 +34,5 @@ def run_log(
         logger.error(msg)
         # Exit with code 1
         sys.exit(1)
+    else:
+        return out
diff --git a/src/fiat/log.py b/src/fiat/log.py
index b4e2b5ab..1dfef070 100644
--- a/src/fiat/log.py
+++ b/src/fiat/log.py
@@ -454,7 +454,7 @@ def __init__(
     def _check_children(
         self,
         obj: DummyLog,
-        logger: "Log",
+        logger: "Logger",
     ):
         """Ensure the hierarchy is corrected downwards."""
         name = logger.name
@@ -467,7 +467,7 @@ def _check_children(
                     logger.parent = child.parent
                 child.parent = logger
 
-    def _check_parents(self, logger: "Log"):
+    def _check_parents(self, logger: "Logger"):
         """Ensure the hierarchy is corrected upwards."""
         name = logger.name
         parent = None
@@ -485,7 +485,7 @@ def _check_parents(self, logger: "Log"):
                 self.logger_tree[substr] = DummyLog(logger)
             else:
                 obj = self.logger_tree[substr]
-                if isinstance(obj, Log):
+                if isinstance(obj, Logger):
                     parent = obj
                     break
                 else:
@@ -497,7 +497,7 @@ def _check_parents(self, logger: "Log"):
 
     def resolve_logger_tree(
         self,
-        logger: "Log",
+        logger: "Logger",
     ):
         """_summary_."""
         obj = None
@@ -556,7 +556,7 @@ def __call__(
         obj = cls.__new__(cls, name, level)
         cls.__init__(obj, name, level)
 
-        res = Log.manager.resolve_logger_tree(obj)
+        res = Logger.manager.resolve_logger_tree(obj)
         if res is not None:
             warn(
                 f"{name} is already in use -> returning currently known object",
@@ -681,7 +681,7 @@ def start(self):
         t.start()
 
 
-class Log(metaclass=Logmeta):
+class Logger(metaclass=Logmeta):
     """Generate a logger.
 
     The list of available logging levels:\n
@@ -738,7 +738,7 @@ def __del__(self):
 
     def __repr__(self):
         _lvl_str = str(LogLevels(self.level)).split(".")[1]
-        return f"<Log {self.name} level={_lvl_str}>"
+        return f"<Logger {self.name} level={_lvl_str}>"
 
     def __str__(self):
         _mem_loc = f"{id(self):#018x}".upper()
@@ -758,7 +758,7 @@ def _log(self, record):
             else:
                 obj = obj.parent
 
-    def handle_log(log_m):
+    def _handle_log(log_m):
         """Wrap logging messages."""
 
         def handle(self, *args, **kwargs):
@@ -808,7 +808,7 @@ def add_file_handler(
 
     @property
     def level(self):
-        """_summary_."""
+        """Return the current logging level."""
         return self._level
 
     @level.setter
@@ -817,32 +817,34 @@ def level(
         val: int,
     ):
         self._level = check_loglevel(val)
+        for h in self._handlers:
+            h.level = val
 
     def _direct(self, msg):
         """_summary_."""
         raise NotImplementedError(NOT_IMPLEMENTED)
 
-    @handle_log
+    @_handle_log
     def debug(self, msg: str):
         """Create a debug message."""
         return 1, msg
 
-    @handle_log
+    @_handle_log
     def info(self, msg: str):
         """Create an info message."""
         return 2, msg
 
-    @handle_log
+    @_handle_log
     def warning(self, msg: str):
         """Create a warning message."""
         return 3, msg
 
-    @handle_log
+    @_handle_log
     def error(self, msg: str):
         """Create an error message."""
         return 4, msg
 
-    @handle_log
+    @_handle_log
     def dead(self, msg: str):
         """Create a kernel-deceased message."""
         return 5, msg
@@ -850,7 +852,7 @@ def dead(self, msg: str):
 
 def spawn_logger(
     name: str,
-) -> Log:
+) -> Logger:
     """Spawn a logger within a hierarchy.
 
     Parameters
@@ -860,17 +862,17 @@ def spawn_logger(
 
     Returns
     -------
-    Log
-        A Log object (for logging).
+    Logger
+        A Logger object (for logging).
     """
-    return Log(name)
+    return Logger(name)
 
 
 def setup_default_log(
     name: str,
     level: int,
-    dst: str,
-) -> Log:
+    dst: str | None = None,
+) -> Logger:
     """Set up the base logger of a hierarchy.
 
     It's advisable to make this a single string that is not concatenated by period.
@@ -882,25 +884,26 @@ def setup_default_log(
         Identifier of the logger.
     level : int
         Logging level.
-    dst : str
+    dst : str | None, optional
         The path to where the logging file will be located.
 
     Returns
     -------
-    Log
-        A Log object (for logging, no really..)
+    Logger
+        A Logger object (for logging, no really..)
     """
     if len(name.split(".")) > 1:
-        raise ValueError()
+        raise ValueError("Only root names (without a period) are allowed.")
 
-    obj = Log(name, level=level)
+    obj = Logger(name, level=level)
 
     obj.add_handler(level=level)
-    obj.add_file_handler(
-        dst,
-        level=level,
-        filename=name,
-    )
+    if dst is not None:
+        obj.add_file_handler(
+            dst,
+            level=level,
+            filename=name,
+        )
 
     return obj
 
diff --git a/src/fiat/models/geom.py b/src/fiat/models/geom.py
index b848cf0f..a36a11eb 100644
--- a/src/fiat/models/geom.py
+++ b/src/fiat/models/geom.py
@@ -303,8 +303,9 @@ def run(
 
         # Setup the jobs
         # First setup the locks
-        lock1 = self._mp_manager.Lock()
-        lock2 = self._mp_manager.Lock()
+        lock1, lock2 = (None, None)
+        if self.threads != 1:
+            lock1, lock2 = [self._mp_manager.Lock()] * 2
         jobs = generate_jobs(
             {
                 "cfg": self.cfg,
diff --git a/test/test_log.py b/test/test_log.py
index ef61b858..30570b3a 100644
--- a/test/test_log.py
+++ b/test/test_log.py
@@ -1,7 +1,7 @@
 import io
 from pathlib import Path
 
-from fiat.log import CHandler, Log, MessageFormatter, spawn_logger
+from fiat.log import CHandler, Logger, MessageFormatter, spawn_logger
 
 
 def test_stream(log1, log2):
@@ -17,7 +17,7 @@ def test_stream(log1, log2):
 
 
 def test_log(tmp_path):
-    log = Log("test_log", level=2)
+    log = Logger("test_log", level=2)
     log.add_handler(
         level=2,
     )